const fs = require('fs');
const path = require('path');
const parse = require('csv-parse').parse;
const habitablePlanets = [];
function isHabitablePlanet(planet) {
    return planet['koi_disposition'] === 'CONFIRMED'
    && planet['koi_insol'] > 0.36 && planet['koi_insol'] < 1.11
    && planet['koi_prad'] < 1.6;
    }
    // 从 CSV ⽂件中加载⾏星数据
    function loadPlanetsData() {
    return new Promise((resolve, reject) => {
    fs.createReadStream(path.join(__dirname, '..','..', 'data', 'kepler_data.csv'))
    .pipe(parse({
    comment: '#',
    columns: true,
    }))
    .on('data', (data) => {
    if (isHabitablePlanet(data)) {
    habitablePlanets.push(data);
    }
    })
    .on('error', (err) => {
    console.log(err);
    reject(err);
})
.on('end', () => {
console.log(`找到${habitablePlanets.length}个可居住星球！`);
resolve();
});
});
}
module.exports = {
loadPlanetsData,
planets: habitablePlanets,
};